Check out Snappy Fax 4.0; it was recommended over at emrupdate by Jason Murdoch and wow! It rocks, both in answering faxes and in sending them off. You can mark up your faxes with primitive but workable markup tools. It can save faxes as both a TIFF and a PDF.
It's free to use for 30 days (unrestricted). Eventual cost is only $29 for 1 license...
http://www.snappysoftware.com/ or
http://www.fileheap.com/download-snappy-fax-7288.html.